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Original question:

UCC21755-Q1: Gate drive power problem

UCC21755-Q1: UCC21755/UCC21756

Venkatkumar M
Prodigy 40 points
Part Number: UCC21755-Q1

Tool/software:

Hi,

We are using a UCC21756  gate drive to run 6 SiC MOSFET in inverter, if one gate driver detects a overcurrent situation it send a fault a signal to microcontroller  to reset all other gate driver at current above 15 A, but instead of resetting all gate driver, how to program microcontroller to decide whether to send reset/not reset signal to all microcontroller?

  • 0
    TI__Expert 8125 points

    Hi Venkatkumar,

    If individual gate driver needs to be reset, then each of the individual gate driver over current status (FLT pin) need to be monitored individually or some logic for the ucontroller to understand the FLT location. Otherwise its not possible to reset only the specific gate driver.

    If each gate driver EN/RST pin can be controlled independently in the system, then by togging EN/RST pin of the specific gate driver, that gate driver alone can be reset. Hope it helps.

  • 0 in reply to Sasikala Thangam
    Prodigy 40 points

    all individual gate driver is being monitored for the overcurrent status(FLT pin), lets consider the s1 is detected a overcurrent and sent fault signal to microcontroller should decide whether to reset all device or not. For that purpose how to implement logic?

  • 0 in reply to Venkatkumar M
    TI__Expert 8125 points

    Hi Venkat,

    If all drivers to be reset/1 driver to be reset will be based on the system safety need and defined by the safety requirement team.

    However it can be implemented by toggling EN/RST for all the drivers or only one driver. If each of the driver EN/RST is available to control independently in the ucontroller, then it can be done by toggling each GPIO independently . 

    Thanks

    Sasi